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Q: When does the code require parapets? What construction and fire-resistance requirements exist for parapets?

A: Parapets are aesthetic features of many buildings—typically vertical extensions of exterior walls used to create architectural elements, conceal rooftop mechanical equipment, or perform other functions. Another purpose of parapets is to impede the spread of fire from one building to another by providing a barrier to fire and radiant heat transfer if fire breaks through the roof membrane